Effervescent compound.



snares UFFIQE.

EMERSON H. STRICKLER, OF NEW YORK, N. Y., ASSIGNOB T0 GENERAI; CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

EFFERVESCENT COMPOUND Specification of Letters Patent.

Patented Aug. 24, 1915.

No Drawing. Original application filed February 29, 1912, Serial No. 680,723. Divided and this application filed July 25, 1912. Serial No. 711,408. 4

vented certain new and useful Improvementsin Effervescent Compounds, of which the following is a specification.

The object of the present invention is to render effervescent compounds, including baking powders, more stable, 2'. e., less prone to change, by providing the alkali constitu-- cut or ingredients thereof which is usually sodium bicarbonate with a coatin of an efiiorescent compound such as dlsodium phosphate.

The use of mono-sodium phosphate as the acid constituent of eflt'ervescent compounds, the stabilizing of such acid constituent and the stabilizing of acrystallizable salt by means of starch form the subject matter of my "application, Serial Number 680,723, filed February 29, 1912, of which the present application is a division.

Of course, my invention is not limited to baking powder, which is here considered an effervescent salt, containing a diluent such as starch, but may be used wherever the substances above referred to may profitably be employed in a more stablecondition than heretofore.

In the effervescent compounds of my invention, I may employ an alkali constituent, stabilized in the manner hereinafter described, with any suitable acid constituent stablized or not stabilized, and as such acid constituent, I may use the salt, such as monosodium phosphate, stabilized as set forth in the above mentioned application. If baking powder is desired to be made, I may, of course, add the usual diluent of starch.

In the following examples, I give an illustrative method for carrying out my invention. These methods may, of course, be varied within wide limits without departing from the spirit of my invention as set forth in the appended claims.

N on-kygroscopic and granular sodium 65- carbonate.Thoroughly wet sodium bicarbonate with a saturated solution of disodium phosphate whose temperature should not be above 110 F.; immediately remove salt, which may be made by mixing together,

for example, 31.5 parts of sodium bicarbonate prepared as described above and 68.5 parts cream tartar. If it is desired to prepare a baking powder, a diluent such as starch is added to such eflervescent salt, the amount of diluent being governed by the legal requirement that a baking powder shall have a certain minimum strength.

The material should be preferably so granulated as to pass a 100 mesh screen and remain on a 200 mesh screen, or coarser, if conditions seem to require it.

I claim:

1. As a new article of manufacture sodium bicarbonate stabilized by means of an efilorescent salt.

2. As a new article of manufacture sodium bicarbonate stabilized by means of di-sodium phosphate.

3. As a new article of manufacture an effervescent salt containing an alkali ingredient and an efilorescent salt as stabilizing agent.

4:. As a new article of manufacture an effervescent salt containing an alkali inedient and di-sodium phosphate as stabi- 'zing agent.

5. As a new article of manufacture an effervescent salt containing as an alkali ingredient sodium bicarbonate and an efliores- 8. Process of stabilizing a salt which conproduct at a temperature below that at sist in treating the salt with a saturated which the sodium bicarbonate begins to lose solution of di-sodium phosphate, removing carbonic acid. the excess liquor and drying the product at In testimony whereof I have hereunto set 15 a gradually increasing temperature but bemy hand in the presence of two subscribing low that at which the salt being stabilized witnesses. begins to fuse or decompose.

9. Process of stabilizing sodium bicar- EMERSON STRIGKLER' bonate which consists in treating it with a Witnesses: saturated solution of di-sodium phosphate, H. W. HILLYER,

removing the excess liquor and drying the JOHN A. FERGUSON. 

